Finding the Fourth Proportional to 42,915.39, 64,360.78 and 12,932.53

Step by Step Solution

1. Step 1: Write the proportion equation
   42,915.39 : 64,360.78 = 12,932.53 : x
2. Step 2: Convert to fraction form
   42,915.39/64,360.78 = 12,932.53/x
3. Step 3: Cross multiply
   42,915.39x = 64,360.78 × 12,932.53
4. Step 4: Simplify right side
   42,915.39x = 832,347,718.17
5. Step 5: Solve for x
   x = 832,347,718.17/42,915.39
6. Step 6: Final answer
   x = 19,395.09